该程序是在linux下执行，首先创建一个文件，然后对此文件进行读写操作。接着，写入“Hello,I m writing to this file!”,此时文件指针位于文件尾部。接着再使用lseek函数将文件指针移到文件开始处，并读出10个字节并将其打印出来。-The program is run under linux, first of all to create a document, and then read and write operations on this file. Then, write " Hello, I' m writing to this file!" , At this time a document file pointer is located in the rear. Lseek function and then use the file pointer to the beginning of a document, and read out 10 bytes and print them out.